net.efano.sandbox.jface.snippets.HelloWorld.java Source code

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Here is the source code for net.efano.sandbox.jface.snippets.HelloWorld.java

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/*******************************************************************************
 * Copyright (c) 2006, 2009 The Pampered Chef, Inc. and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     The Pampered Chef, Inc. - initial API and implementation
 *     Brad Reynolds - bug 116920
 *     Benjamin Cabe - bug 252219
 *     Matthew Hall - bug 260329
 ******************************************************************************/

package net.efano.sandbox.jface.snippets;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.PojoObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Hello, databinding. Bind changes in a GUI to a Model object but don't worry
 * about propogating changes from the Model to the GUI.
 * <p>
 * Illustrates the basic Model-ViewModel-Binding-View architecture typically
 * used in data binding applications.
 */
public class HelloWorld {
    public static void main(String[] args) {
        Display display = new Display();
        final ViewModel viewModel = new ViewModel();

        Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
            public void run() {
                final Shell shell = new View(viewModel).createShell();
                // The SWT event loop
                Display display = Display.getCurrent();
                while (!shell.isDisposed()) {
                    if (!display.readAndDispatch()) {
                        display.sleep();
                    }
                }
            }
        });
        // Print the results
        System.out.println("person.getName() = " + viewModel.getPerson().getName());
    }

    // The data model class. This is normally a persistent class of some sort.
    // 
    // In this example, we only push changes from the GUI to the model, so we
    // don't worry about implementing JavaBeans bound properties. If we need
    // our GUI to automatically reflect changes in the Person object, the
    // Person object would need to implement the JavaBeans property change
    // listener methods.
    static class Person {
        // A property...
        String name = "HelloWorld";

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }

    // The View's model--the root of our Model graph for this particular GUI.
    //
    // Typically each View class has a corresponding ViewModel class.
    // The ViewModel is responsible for getting the objects to edit from the
    // DAO. Since this snippet doesn't have any persistent objects to
    // retrieve, this ViewModel just instantiates a model object to edit.
    static class ViewModel {
        // The model to bind
        private Person person = new Person();

        public Person getPerson() {
            return person;
        }
    }

    // The GUI view
    static class View {
        private ViewModel viewModel;
        private Text name;

        public View(ViewModel viewModel) {
            this.viewModel = viewModel;
        }

        public Shell createShell() {
            // Build a UI
            Display display = Display.getDefault();
            Shell shell = new Shell(display);
            shell.setLayout(new RowLayout(SWT.VERTICAL));
            name = new Text(shell, SWT.BORDER);

            // Bind it
            DataBindingContext bindingContext = new DataBindingContext();
            Person person = viewModel.getPerson();

            bindingContext.bindValue(SWTObservables.observeText(name, SWT.Modify),
                    PojoObservables.observeValue(person, "name"));

            // Open and return the Shell
            shell.pack();
            shell.open();
            return shell;
        }
    }

}